habanalabs: add hwmgr module for gaudi

The hwmgr module is responsible for messages sent to GAUDI F/W that are
not common to all habanalabs ASICs.

In GAUDI, we provide the user a simplified mode of controlling the ASIC
clock frequency. Instead of three different clocks, we present a single
clock property that the user can configure via sysfs.

Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

Documentation/ABI/testing/sysfs-driver-habanalabs

@@ -10,6 +10,23 @@ KernelVersion:  5.1
 Contact:        oded.gabbay@gmail.com
 Description:    Version of the application running on the device's CPU
 
+What:           /sys/class/habanalabs/hl<n>/clk_max_freq_mhz
+Date:           Jun 2019
+KernelVersion:  not yet upstreamed
+Contact:        oded.gabbay@gmail.com
+Description:    Allows the user to set the maximum clock frequency, in MHz.
+                The device clock might be set to lower value than the maximum.
+                The user should read the clk_cur_freq_mhz to see the actual
+                frequency value of the device clock. This property is valid
+                only for the Gaudi ASIC family
+
+What:           /sys/class/habanalabs/hl<n>/clk_cur_freq_mhz
+Date:           Jun 2019
+KernelVersion:  not yet upstreamed
+Contact:        oded.gabbay@gmail.com
+Description:    Displays the current frequency, in MHz, of the device clock.
+                This property is valid only for the Gaudi ASIC family
+
 What:           /sys/class/habanalabs/hl<n>/cpld_ver
 Date:           Jan 2019
 KernelVersion:  5.1

drivers/misc/habanalabs/gaudi/Makefile

@@ -1,4 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
 subdir-ccflags-y += -I$(src)
 
-HL_GAUDI_FILES := gaudi/gaudi.o
+HL_GAUDI_FILES := gaudi/gaudi.o gaudi/gaudi_hwmgr.o

drivers/misc/habanalabs/gaudi/gaudi.c

@@ -7306,9 +7306,9 @@ static const struct hl_asic_funcs gaudi_funcs = {
 	.debugfs_write32 = gaudi_debugfs_write32,
 	.debugfs_read64 = gaudi_debugfs_read64,
 	.debugfs_write64 = gaudi_debugfs_write64,
-	.add_device_attr = NULL,
+	.add_device_attr = gaudi_add_device_attr,
 	.handle_eqe = gaudi_handle_eqe,
-	.set_pll_profile = NULL,
+	.set_pll_profile = gaudi_set_pll_profile,
 	.get_events_stat = gaudi_get_events_stat,
 	.read_pte = gaudi_read_pte,
 	.write_pte = gaudi_write_pte,
@@ -7332,7 +7332,7 @@ static const struct hl_asic_funcs gaudi_funcs = {
 	.rreg = hl_rreg,
 	.wreg = hl_wreg,
 	.halt_coresight = NULL,
-	.get_clk_rate = NULL,
+	.get_clk_rate = gaudi_get_clk_rate,
 	.get_queue_id_for_cq = gaudi_get_queue_id_for_cq,
 	.read_device_fw_version = gaudi_read_device_fw_version,
 	.load_firmware_to_device = gaudi_load_firmware_to_device,

drivers/misc/habanalabs/gaudi/gaudiP.h

@@ -248,4 +248,9 @@ struct gaudi_device {
 	u8				ext_queue_idx;
 };
 
+void gaudi_add_device_attr(struct hl_device *hdev,
+			struct attribute_group *dev_attr_grp);
+void gaudi_set_pll_profile(struct hl_device *hdev, enum hl_pll_frequency freq);
+int gaudi_get_clk_rate(struct hl_device *hdev, u32 *cur_clk, u32 *max_clk);
+
 #endif /* GAUDIP_H_ */

drivers/misc/habanalabs/gaudi/gaudi_hwmgr.c

@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2016-2018 HabanaLabs, Ltd.
+ * All Rights Reserved.
+ */
+
+#include "gaudiP.h"
+#include "include/gaudi/gaudi_fw_if.h"
+
+void gaudi_set_pll_profile(struct hl_device *hdev, enum hl_pll_frequency freq)
+{
+	struct gaudi_device *gaudi = hdev->asic_specific;
+
+	if (freq == PLL_LAST)
+		hl_set_frequency(hdev, MME_PLL, gaudi->max_freq_value);
+}
+
+int gaudi_get_clk_rate(struct hl_device *hdev, u32 *cur_clk, u32 *max_clk)
+{
+	long value;
+
+	if (hl_device_disabled_or_in_reset(hdev))
+		return -ENODEV;
+
+	value = hl_get_frequency(hdev, MME_PLL, false);
+
+	if (value < 0) {
+		dev_err(hdev->dev, "Failed to retrieve device max clock %ld\n",
+			value);
+		return value;
+	}
+
+	*max_clk = (value / 1000 / 1000);
+
+	value = hl_get_frequency(hdev, MME_PLL, true);
+
+	if (value < 0) {
+		dev_err(hdev->dev,
+			"Failed to retrieve device current clock %ld\n",
+			value);
+		return value;
+	}
+
+	*cur_clk = (value / 1000 / 1000);
+
+	return 0;
+}
+
+static ssize_t clk_max_freq_mhz_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct hl_device *hdev = dev_get_drvdata(dev);
+	struct gaudi_device *gaudi = hdev->asic_specific;
+	long value;
+
+	if (hl_device_disabled_or_in_reset(hdev))
+		return -ENODEV;
+
+	value = hl_get_frequency(hdev, MME_PLL, false);
+
+	gaudi->max_freq_value = value;
+
+	return sprintf(buf, "%lu\n", (value / 1000 / 1000));
+}
+
+static ssize_t clk_max_freq_mhz_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct hl_device *hdev = dev_get_drvdata(dev);
+	struct gaudi_device *gaudi = hdev->asic_specific;
+	int rc;
+	u64 value;
+
+	if (hl_device_disabled_or_in_reset(hdev)) {
+		count = -ENODEV;
+		goto fail;
+	}
+
+	rc = kstrtoull(buf, 0, &value);
+	if (rc) {
+		count = -EINVAL;
+		goto fail;
+	}
+
+	gaudi->max_freq_value = value * 1000 * 1000;
+
+	hl_set_frequency(hdev, MME_PLL, gaudi->max_freq_value);
+
+fail:
+	return count;
+}
+
+static ssize_t clk_cur_freq_mhz_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct hl_device *hdev = dev_get_drvdata(dev);
+	long value;
+
+	if (hl_device_disabled_or_in_reset(hdev))
+		return -ENODEV;
+
+	value = hl_get_frequency(hdev, MME_PLL, true);
+
+	return sprintf(buf, "%lu\n", (value / 1000 / 1000));
+}
+
+static DEVICE_ATTR_RW(clk_max_freq_mhz);
+static DEVICE_ATTR_RO(clk_cur_freq_mhz);
+
+static struct attribute *gaudi_dev_attrs[] = {
+	&dev_attr_clk_max_freq_mhz.attr,
+	&dev_attr_clk_cur_freq_mhz.attr,
+	NULL,
+};
+
+void gaudi_add_device_attr(struct hl_device *hdev,
+			struct attribute_group *dev_attr_grp)
+{
+	dev_attr_grp->attrs = gaudi_dev_attrs;
+}